feat(products-ui): import run detail (§5.5, PUC-4/5/8)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/screens/products/RunDetail.tsx

@@ -1,5 +1,89 @@
-// Run detail (SD-0002 §5.5) — stub; Task 14 replaces this with the run report.
+// Run detail (SD-0002 §5.5) — report card for a completed or in-progress import run.
+// NO images section this slice (SLICE-7). PUC-4/5/8.
+import { useEffect, useState } from "react";
+import { getRun, type RunDetail as RunDetailType } from "../../productsApi";
+import { Banner } from "../../ui/kit";
+
+const STATUS_LABELS: Record<string, string> = {
+  applying: "Importing…",
+  fetching_images: "Fetching images…",
+  complete: "Complete",
+  complete_with_problems: "Complete with problems",
+};
+
 export default function RunDetail({ runId }: { runId: number }) {
-  void runId;
+  const [run, setRun] = useState<RunDetailType | null>(null);
-  return null;
+  const [loadFail, setLoadFail] = useState<"gone" | "failed" | null>(null);
+
+  async function load() {
+    setLoadFail(null);
+    const resp = await getRun(runId);
+    if (!resp.ok) {
+      setLoadFail(resp.status === 404 ? "gone" : "failed");
+      return;
+    }
+    setRun(resp.value);
+  }
+  useEffect(() => {
+    void load();
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [runId]);
+
+  if (loadFail === "gone") {
+    return (
+      <Banner tone="attn" title="No such import run">
+        <a href="#/products">← Products</a>
+      </Banner>
+    );
+  }
+  if (loadFail === "failed") {
+    return (
+      <Banner tone="attn" title="Couldn't load this import run">
+        Something went wrong on our side.{" "}
+        <button type="button" className="linklike" onClick={() => void load()}>
+          Retry
+        </button>
+      </Banner>
+    );
+  }
+  if (!run) return <p className="note">Loading…</p>;
+
+  const dialectLabel = run.dialect === "canonical" ? "Canonical format" : run.dialect;
+
+  return (
+    <div className="products">
+      <p className="note">
+        <a href="#/products">← Products</a>
+      </p>
+      <h1>{run.file_name}</h1>
+      <p className="note">
+        Imported {new Date(run.created_at).toLocaleString()} by {run.by} · {dialectLabel}
+      </p>
+      <p className="note">
+        {run.products_added} added · {run.products_updated} updated · {run.rows_errored} rows in
+        error
+      </p>
+      <p className="note">{STATUS_LABELS[run.status] ?? run.status}</p>
+      {run.errors.length > 0 && (
+        <table className="errortable">
+          <thead>
+            <tr>
+              <th>Line</th>
+              <th>Column</th>
+              <th>Problem</th>
+            </tr>
+          </thead>
+          <tbody>
+            {run.errors.map((e, i) => (
+              <tr key={i}>
+                <td>{e.line}</td>
+                <td>{e.column ?? ""}</td>
+                <td>{e.message}</td>
+              </tr>
+            ))}
+          </tbody>
+        </table>
+      )}
+    </div>
+  );
 }